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#!/bin/bash
s='blahaaaaaa goog sdd 234 3242423
ala el-213123123123 
1231231313123,141241'
perl -pe 's/\d{10,}/$&=~s|\d{3}|$& |gr/ge' <<< "$s"

Success #stdin #stdout 0s 4904KB

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Standard input is empty

stdout

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blahaaaaaa goog sdd 234 3242423
ala el-213 123 123 123  
123 123 131 312 3,141241

https://ideone.com/Kss4GM

language:

Bash (bash 5.0.3)

created:

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secret

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